JPH1186396A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device capable of correctly positioning a double- sided disk having a stuck structure and keeping good disk reproducing/recording operation. SOLUTION: This device is provided with a holding ring 21 held in a motor shaft 29 to be freely moved in a radial direction, a disk holding member 22 provided in the holding ring 21 to be freely moved in the radial direction and engaged with the upper surface side edge part of the center hole of a disk for holding the disk, a compression spring 23 for pressing this holding member 23 in a direction away from the motor shaft, a centering member 24 supported on the motor shaft to be freely moved in a thrust direction and engaged with the lower surface side (reproducing surface side) of the center hole of the disk for positioning the disk and a compression spring 25 for pressing the member 24 in the thrust direction. By positioning the disk by the edge part of the reproducing surface side of the center hole of the double surface disk, a double surface disk having shifted sticking is also positioned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for reproducing or recording an optical disk such as a DVD.

[0002]

2. Description of the Related Art Conventionally, CD-ROM drives and DV
As a centering clamp mechanism for a disc in an optical disc drive such as a D drive, particularly in a thin optical disc drive incorporated in a notebook computer or the like,
There are the following:

As shown in FIG. 6, a centering clamp mechanism as a conventional example includes a disk table 42 pressed into a motor shaft 41 and a holding ring pressed into the motor shaft 41 at a portion protruding above the disk table 42. 43
A plurality of (eg, three) pin-shaped disk alignment members 44 held in the holding ring 43 so as to be able to advance and retreat in the radial direction of the motor shaft 41, and a direction in which the disk alignment members 44 are moved away from the motor shaft 41. It mainly comprises a compression spring 45 for biasing. In addition, rubber 4 for preventing the disk from slipping is provided on the periphery of the disk table 42.
6 is pasted.

A part of the disk centering member 44 projects radially from the outer periphery of the holding ring 43, and this projection is engaged with the lower edge of the center hole of the disk D when the disk D is mounted. First tapered surface 44 to be combined
a, and a second tapered surface 44b for engaging the upper surface edge portion of the center hole of the disk D and restraining the disk D with the disk table 42 is formed.

In such a conventional centering clamp mechanism, when the disk D is mounted, the disk D
When the first tapered surface 44a of the disk alignment member 44 is pressed by the lower edge of the center hole of the center hole, the disk alignment member 44 is pushed into the holding ring 43 while opposing the compression force of the compression spring 45. Further, as the disk D is dropped, the lower edge of the center hole of the disk D becomes the first tapered surface 4 of the disk centering member 44.
4a, instead of the upper edge of the center hole of the disk D and the second tapered surface 4 of the disk centering member 44.
4b is engaged. As a result, the disk D is guided downward along the second tapered surface 44b of the disk centering member 44, and is placed on the rubber 46 attached to the peripheral portion of the disk table 42.

In this manner, the positioning of the disk D by the disk centering member 44, that is, the centering of the centering clamp mechanism and the disk D is performed, and the disk centering member 44 and the disk table 42 are aligned.
The holding (clamping) of the disk D is achieved.

[0007]

In recent years, a double-sided disc having a structure in which two discs are bonded to each other has been marketed as a medium such as a DVD in recent years. In this double-sided disc, the misalignment of the upper and lower discs is recognized to 0.1 mm according to the standard.

When such a double-sided disk is mounted on the above-mentioned conventional centering clamp mechanism, the disk is positioned in the center hole of the disk Db on the upper surface side as shown in FIG. The rotation of the disk Da on the lower surface side, which is the recording surface, becomes eccentric reflecting the bonding deviation between the upper and lower disks, and good reproduction cannot be maintained in some cases.

The present invention has been made to solve such a problem, and a disk device capable of correctly aligning a center with a double-sided disk having a bonded structure and capable of maintaining a good disk reproduction or recording operation. The purpose is to provide.

[0010]

According to a first aspect of the present invention, there is provided a disk drive, comprising: a motor for driving a disk; and a radial movement of a drive shaft of the motor. A ring member that is freely supported, a holding member that is movably held in the radial direction by the ring member, and that holds the disk by engaging an edge of one side of a center hole of the disk; and driving the holding member. A biasing member for biasing in a direction away from the shaft, and a positioning member supported by the drive shaft and engaged with an edge of the other side of the center hole of the disk to position the disk. I do.

Further, the disk device of the present invention is characterized in that
A motor for driving the disk, a ring member movably supported in a radial direction by a drive shaft of the motor, and a ring member movably held in a radial direction by the ring member. A holding member that holds the disk by engaging with the edge on the front side, a first biasing member that biases the holding member in a direction away from the drive shaft, and is supported by the drive shaft so as to be movable in the thrust direction. A positioning member for engaging the edge of the other side of the center hole of the disk to position the disk, and a second urging member for urging the positioning member in the thrust direction. .

Further, according to a third aspect of the present invention, there is provided a disk drive comprising: a motor for driving a disk;
A disk table fixed to the drive shaft of the motor, a ring member movably supported in the radial direction by the drive shaft, and a ring member movably provided in the radial direction,
A holding member for holding the disk by engaging an edge of the center hole of the disk mounted on the disk table opposite to the table mounting surface, and urging the holding member away from the drive shaft Biasing member, and supported by the drive shaft,
And a positioning member for positioning the disk by engaging the edge of the center hole of the disk mounted on the disk table on the table mounting surface side.

Further, according to the present invention, there is provided a disk drive comprising: a motor for driving a disk;
A disk table fixed to the drive shaft of the motor, a ring member movably supported in the radial direction by the drive shaft, and a ring member movably provided in the radial direction,
A holding member for holding the disk by engaging an edge of the center hole of the disk mounted on the disk table opposite to the table mounting surface, and attaching the holding member in a direction away from the drive shaft; A first urging member for urging, the disk being movably supported in a thrust direction by a drive shaft, engaging with an edge portion of a center hole of the disk mounted on the disk table on the table mounting surface side, and And a second urging member for urging the positioning member in the thrust direction.

According to a fifth aspect of the present invention, there is provided a disk drive, comprising: a pickup for reading or writing a signal from or to a disk; a motor for driving the disk; and a disk fixed to a drive shaft of the motor. A table, a positioning member that is supported by the drive shaft and engages with an edge of the center hole of the disc mounted on the disc table on the first surface side facing the optical pickup to position the disc; A ring member movably supported in the radial direction by the drive shaft; and a ring member movably provided in the ring member in the radial direction, opposite to the first surface side of the center hole of the disc mounted on the disc table. A holding member that holds the disk by engaging the edge portion on the second surface side, and a biasing member that biases the holding member in a direction away from the drive shaft. It is characterized in.

Further, according to a sixth aspect of the present invention, there is provided a disk drive, comprising: a pickup for reading or writing a signal from or to a disk; a motor for driving the disk; and a disk fixed to a drive shaft of the motor. A table, a positioning member that is supported by the drive shaft and engages with an edge of the center hole of the disc mounted on the disc table on the first surface side facing the optical pickup to position the disc; A ring member movably supported in the radial direction by the drive shaft; and a ring member movably provided in the ring member in the radial direction, opposite to the first surface side of the center hole of the disc mounted on the disc table. A holding member that holds the disc by engaging with an edge portion on the second surface side of the first member, a first biasing member that biases the holding member in a direction away from the drive shaft, Characterized by comprising a second urging member for urging the-decided Me member in the thrust direction.

In the disk device of the present invention, the centering (positioning) of the disk is performed by the positioning member at the edge on the side of the surface where the reproduction or recording of the center hole of the disk is performed. The holding member held by the ring member functions as a member for holding the positioned disk with the disk table.

When a double-sided disk having a structure in which two disks are bonded is mounted, the displacement between the upper and lower disks of the double-sided disk is caused by the radial direction secured between the drive shaft of the motor and the ring member. Absorbed in the gap. For this reason, the engagement state (disc holding form) between each holding member held by the ring member and the disk does not vary, and the disk can be held satisfactorily. On the other hand, the positioning of the disk by the positioning member
Since the recording or reproduction is performed at the edge portion on the side of the center hole of the disc where the reproduction or recording is performed, the disc can be correctly positioned even if there is a misalignment between the upper and lower discs, and a stable disc reproduction operation can be maintained. Become like

Further, a total of six or more disk engaging portions of the holding member and the positioning member are alternately arranged at substantially equal angular intervals around the drive shaft of the motor, so that the holding and positioning of the disk can be stabilized. It is desirable to do.

Since the ring member is supported movably in the radial direction with respect to the drive shaft of the motor,
It is preferable to add a stopper for preventing the ring-shaped member from coming off from the motor shaft.

Further, in the present invention, when the disk is being held, the urging force of the second urging means is the force by which the first urging means presses the disk through the holding member in the thrust direction of the motor drive shaft. It is required to be smaller. If the force for urging the positioning member in the thrust direction toward the holding member by the second urging means is larger than the force for pressing the disk toward the positioning member in the thrust direction through the holding member by the first urging means. As a result, a desired disk holding force cannot be obtained, for example, the disk is likely to slip or fall off.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

In the present embodiment, for example, a DVD for reproducing a double-sided disc having a structure in which two DVD discs are bonded to each other
The present invention is applied to a drive.

FIG. 1 is a perspective view showing the overall structure of such a DVD drive.

This DVD drive drives a disk.
It comprises a movable body 1 (hereinafter, referred to as a drawer) on which each mechanism system to be reproduced is mounted, and a cabinet 2 capable of accommodating the drawer 1. The guide protrusions 1a provided on both sides of the drawer 1 serve as guide support portions 2a of the cabinet 2.
And a slide type drawer receiving member 3. Thereby, the drawer 1 is transported inside and outside the cabinet 2 in parallel with the surface of the disk mounted thereon. The insertion of the drawer 1 into the cabinet 2 is performed manually. The discharge of the drawer 1 is automatically performed by the microcomputer detecting that the switch 1c provided on the front panel 1b of the drawer 1 has been pressed and outputting a drive signal to the ejection motor 12 automatically. Done.

The drawer 1 is formed with a concave portion 4 adapted to the outer shape of an optical disk (not shown). A turntable 6 is arranged at the center of the recess 4. On the turntable 6, a mechanism (hereinafter, referred to as a disc centering clamp mechanism) 5 for coupling with the center hole of the optical disc and positioning and holding the optical disc at the center of the turntable 6 is provided. Is provided. The centering clamp mechanism 5 will be described later in detail. The turntable 6 is directly connected to a drive shaft of a disk motor (not shown) mounted in the drawer 1.

In the drawer 1, in addition to the disk drive mechanism including the disk motor and the turntable 6, an optical pickup 7, a pickup feed mechanism for transporting the optical pickup 7, and a drawer 1 including a cabinet 2 A drawer-ejection mechanism including an ejection motor 12 for automatically ejecting the paper from the inside is mounted. Further, an opening 8 for exposing at least a portion of the pickup lens 7 a of the optical pickup 7 is formed in the concave portion 4 of the drawer 1.

On the other hand, a circuit board 9 on which various electronic components such as a semiconductor device such as a microcomputer, a memory, and a drive circuit of various motors and connectors are mounted is fixed in the cabinet 2. The circuit board 9 in the cabinet 2 is electrically connected to each mechanism in the drawer 1 through a flexible wiring board 10.

Next, the details of the disk centering clamp mechanism 5 will be described. 2 to 4 are sectional views showing the configuration of the centering clamp mechanism 5 together with its movement.

As shown in these figures, the centering clamp mechanism 5 comprises a holding ring 21, a pin-shaped disk holding member 22, and a compression spring 2 for the disk holding member.
3, a centering member 24, a compression spring 25 for the centering member, a disk table 26, a rubber 27, and a stopper 28 for a retaining ring. The disk table 26 and the rubber 27 correspond to the turntable 6 described above.
Is equivalent to

The disk table 26 is pressed into a motor shaft 29 and rotates integrally with the motor shaft 29. The holding ring 21 and the centering member 24 are fitted into the motor shaft 29 at a portion protruding above the disk table 26 through respective center holes 21a, 24a. A predetermined gap (play) Ga is secured between the center hole 21a of the holding ring 21 and the motor shaft 29 so that the holding ring 21 can move in the radial direction of the motor shaft 29 within, for example, 0.1 mm. Have been. The retaining ring 21 is locked to the head of the motor shaft 29 by a stopper metal 28 so as not to come off upward.

A plurality of sets (three sets in this embodiment) of the disc holding member 22 and the compression spring 23 are provided on the holding ring 21.
Is held. In the holding ring 21, the disk holding member 22 is movable in the radial direction of the motor shaft 29, and one end of the disk holding member 22 protrudes from the outer peripheral surface of the holding ring 21 in the radial direction. The protruding portion of the disk holding member 22 has a first tapered surface 22a which is engaged with the lower surface edge of the center hole D1 of the disk D in the process of mounting the disk D (see the portion B in FIG. 3). Table 26
A second functioning to engage the upper surface edge of the center hole D1 of the disc D mounted thereon to hold the disc D;
(See D in FIG. 4). The compression spring 23 is means for urging the disk holding member 22 in a direction away from the motor shaft 29.

The centering member 24 is supported by the motor shaft 29 so as to be movable only in the thrust direction. A compression spring 25 is sandwiched between the centering member 24 and a disk table 26 disposed below the centering member 24. The centering member 24 is urged upward by the compression spring 25, that is, in a direction away from the disk table 26, and the retaining ring 21 prevents the centering member 24 from slipping upward. The centering member 24 is formed with a tapered surface 24a (see portion C in FIG. 4) which functions to engage with the lower surface edge of the center hole D1 of the disk D to perform centering (positioning) of the disk D. Have been.

FIG. 5 shows the disk holding member 22 and the centering member 24 in the centering clamp mechanism 5.
1 shows an arrangement configuration on a plane. As shown in the figure, the disk engaging portions of the disk holding member 22 and the centering member 24 are provided at three places (a total of six places) around the holding ring 21 so that the disk can be stably held and positioned. Are arranged alternately at equal angular intervals.

Next, the operation of the centering clamp mechanism 5 configured as described above will be described.

FIG. 2 shows a state of the centering clamp mechanism 5 before the disk D is mounted. At this time, the centering member 24 is at the height position determined by the contact between the holding ring 21 and the upper and lower end surfaces at the portion A.

FIG. 3 shows the state of the centering clamp mechanism 5 in the process of mounting the disk D. At this time, as shown in the portion B, the center hole D
The first tapered surface 22a of the disk holding member 22 is pressed by the lower surface edge of the disk holding member 22 so that the disk holding member 22
Is pushed into the holding ring 21 while opposing the compression force of the compression spring 23. When the disk D is further dropped downward, the lower edge of the center hole D1 of the disk D goes over the first tapered surface 22a of the disk holding member 22, and instead, the upper edge of the center hole D1 of the disk D And the second tapered surface 22b of the disk holding member 22 is engaged. As a result, the disk D is guided downward along the second tapered surface 22b of the disk holding member 22.

FIG. 4 shows a state where the mounting of the disk D is completed. At this time, the disc D rests on the rubber 27 adhered to the periphery of the disc table 26, and as shown in the portion C, the lower surface edge of the center hole D1 of the disc D is formed by the tapered surface of the centering member 24. The disk is positioned (aligned) by being engaged with the member 24a.

By the way, as described above, a double-sided disk having a structure in which two disks are bonded to each other is allowed by the standard to have a bonding deviation of 0.1 mm between the upper and lower disks. Therefore, a case is considered in which a double-sided disc having such a displacement is attached to the centering clamp mechanism 5 of the present embodiment.

In the present embodiment, first, since the positioning is performed at the lower edge portion of the center hole D1 of the disk D, that is, the center hole of the disk Da on the disk surface side to be reproduced, the double-sided disk having misalignment is also used. The disc can be correctly aligned. On the other hand, the center of the disk Db on the upper surface side and the center of the centering clamp mechanism 5 are displaced by the amount of misalignment between the upper and lower disks, but the holding ring 21 is allowed between the motor shaft 29 and the standard for a double-sided disk. Since there is a gap Ga in the radial direction corresponding to the size (0.1 mm) of the bonding misalignment, the above gap is absorbed by this gap Ga. Therefore, each disk holding member 22
The engagement state between the disk D and the disk D does not vary, and the disk D is maintained in a good holding state.

As described above, according to the present embodiment, the centering member 24 positions the disk with respect to the center hole of the reproduction disk surface, and the positioned disk is placed on the disk holding member 2 of the holding ring 21.
2, the disc is held from above while absorbing the displacement between the upper and lower disks, so that even if there is a displacement in the bonding between the upper and lower disks, the disc can be correctly positioned, and a stable disc reproducing operation can be maintained. Become like

In the centering clamp mechanism of the present embodiment, when the disk is in the disk clamping state, the force of the centering member 24 pressing the disk in the thrust direction of the motor shaft 29 is applied to each disk holding member 22 through the tapered surface 22b. It is required that the force is smaller than the force pressing the disk in the thrust direction. Therefore, it is necessary to select the compression springs 25 for pressing the centering member 24 and the compression springs 23 for pressing the disk holding member 22 having optimal spring forces so as to satisfy such conditions.

The embodiment in which the present invention is applied to a DVD drive has been described above. However, the present invention is applicable to any system (for example, a CD-ROM drive, etc.) as long as the device includes a mechanism for driving an optical disk. The present invention can be applied not only to a device for reproducing an optical disk, but also to a disk device (for example, an MO drive, a CD-R drive, a CD-RW drive, etc.) capable of recording data on the optical disk.

[0043]

As described above, according to the disk device of the present invention, the positioning of the disk is performed at the edge portion on the surface side of the center hole of the center hole of the double-sided disk having the structure in which the two disks are bonded together. This makes it possible to correctly position a double-sided disc having misalignment, so that good disc reproduction or recording operation can be maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a DVD drive according to an embodiment to which the present invention is applied.

FIG. 2 is a cross-sectional view showing a state of the centering clamp mechanism of the DVD drive in FIG. 1 before a disc is mounted.

3 is a sectional view showing a state of the centering clamp mechanism of FIG. 2 in a process of mounting a disk.

FIG. 4 is a cross-sectional view showing a state of the centering clamp mechanism of FIG. 2 after the completion of mounting the disc;

FIG. 5 is a plan view of the centering clamp mechanism of FIG. 2;

FIG. 6 is a sectional view showing a configuration of a centering clamp mechanism of a conventional disk drive.

[Explanation of symbols]

 D: Disk (double-sided disk) D1: Center hole of disk Da: Disk on lower side Db: Disk on upper side Ga: Gaps between motor shaft and holding ring 5: Centering clamp mechanism 21: Holding Ring 22: Disk holding member 23: Compression spring for disk holding member 24: Centering member 25: Compression spring for centering member 26: Disk table 27: Rubber 28: Stopper 29: Motor shaft

Claims (10)

[Claims] A motor for driving a disk; a ring member movably supported in a radial direction on a drive shaft of the motor; a ring member movably held in the radial direction by the ring member;
A holding member that holds the disk by engaging an edge portion on one surface side of the center hole of the disk, an urging member that urges the holding member in a direction away from the drive shaft, and supported by the drive shaft And a positioning member for positioning the disk by engaging the edge on the other surface side of the center hole of the disk. 2. A motor for driving a disk, a ring member movably supported in a radial direction by a drive shaft of the motor, and a ring member movably held in the radial direction by the ring member,
A holding member that holds the disk by engaging an edge portion on one surface side of a center hole of the disk, a first biasing member that biases the holding member in a direction away from the drive shaft, and the drive shaft A positioning member that is movably supported in the thrust direction and engages with the edge of the other side of the center hole of the disk to position the disk; and a second member that urges the positioning member in the thrust direction. A disk device comprising an urging member. 3. A motor for driving a disk, a disk table fixed to a drive shaft of the motor, a ring member movably supported on the drive shaft in a radial direction, and a radial member on the ring member. Freely provided,
A holding member for holding the disk by engaging an edge of the center hole of the disk mounted on the disk table opposite to the table mounting surface, and a direction for moving the holding member away from the drive shaft A positioning member that is supported by the drive shaft and engages with an edge of a center hole of the disk mounted on the disk table on the table mounting surface side to position the disk; A disk device comprising: 4. A motor for driving a disk, a disk table fixed to a drive shaft of the motor, a ring member movably supported on the drive shaft in a radial direction, and a radial member on the ring member. Freely provided,
A holding member for holding the disk by engaging an edge of the center hole of the disk mounted on the disk table opposite to the table mounting surface, and a direction for moving the holding member away from the drive shaft A first urging member that urges the disk, and is movably supported in the thrust direction by the drive shaft, and engages with an edge of a center hole of the disk mounted on the disk table on the table mounting surface side. And a second urging member for urging the positioning member in the thrust direction. 5. A pickup for reading or writing a signal to or from a disk, a motor for driving the disk, a disk table fixed to a drive shaft of the motor, a disk table supported by the drive shaft, and mounted on the disk table. A positioning member for positioning the disk by engaging an edge portion of the center hole of the placed disk on the first surface side facing the optical pickup; and a positioning member movably supported in the radial direction by the drive shaft. A ring member, and the ring member is provided movably in a radial direction,
A holding member that holds the disk by engaging an edge of a center hole of the disk placed on the disk table on a second surface side opposite to the first surface side; And a biasing member for biasing the drive shaft away from the drive shaft. 6. A pickup for reading or writing a signal to or from a disk, a motor for driving the disk, a disk table fixed to a drive shaft of the motor, and a disk supported by the drive shaft and mounted on the disk table. A positioning member for positioning the disk by engaging an edge portion of the center hole of the placed disk on the first surface side facing the optical pickup; and a positioning member movably supported in the radial direction by the drive shaft. A ring member, and the ring member is provided movably in a radial direction,
A holding member that holds the disk by engaging an edge of a center hole of the disk placed on the disk table on a second surface side opposite to the first surface side; A first urging member for urging the positioning member in a direction away from the drive shaft, and a second urging member for urging the positioning member in the thrust direction. 7. The disk device according to claim 1, wherein the disk is a double-sided disk having a structure in which two disks are bonded to each other. 8. The disk drive according to claim 1, wherein the disk engaging portions of the holding member and the positioning member are alternately measured at substantially equal angular intervals about the motor shaft. A disk device comprising six or more disks. 9. The disk drive according to claim 1, further comprising a stopper that locks the ring member to the motor shaft so that the ring member does not come off the shaft of the motor. Disk device. 10. The disk device according to claim 2, wherein when the disk is being held, the urging force of the second urging means is equal to that of the first urging means. A disk device characterized in that the force is smaller than a force for pressing a disk in a thrust direction through a holding member.